PROBLEM SOLVING. Express your answer to the fourth decimal places. Show complete solution. Box your final answer. 1. A wooden object found in an Indian burial ground and subjected to radiocarbon dating, The decay rate associated with C-14 is 10 disintegrations per minute per gram carbon. What is the age of the objects 2. Co-60 is used extensively In radiotherapy as a source of y-rays. Ils half-life is 5.27 years. a) How many years will it take to decrease to 35% of Ils original activity? b) If a cobalt source is ten years old, what percent of its original activity remainsę 3. A 1.50 g sample of a compound containing only CH and o was bumed completely. The only combustion products were 1.738 g CO2 and 0.711 g of water. What is the empirical formula and molecular formula of the compound? (MW = 152 g/mol) 4. 100 kmoles of Heptane is bumed with 35% excess alr. Find the composition of the flue gas if combustion is complete 5. Determine the cell potential of the following system: a) Pb/PbSO://Pb2+/Pb b) Fe2+/Fe3+/MnO4/Mn2+